netmap.inf error

I have a single server (Dell Poweredge 600sc) windows 2000 domain that I need to upgrade to Windows 2003 Standard R2. Adprep for both the forest and the domain completed with out any problems from the second CD.

But when I try to perform the actual update, I receive the following error:

?Error reading information from netmap.inf from OEM directories pre-set by the Administrator?

After that it will only let me perform a new install and not an upgrade. I have tried importing a generic netmap.inf file but am not sure where it should reside. I have also edited the device path in the registry all with no avail.

Any Ideas where to go fro here?